David Walliams and his wife Lara Stone during the Teenage Cancer Trust series of charity gigs, at the Royal Albert Hall, in London.

Lara Stone (left) and Jameela Jamil during the Teenage Cancer Trust series of charity gigs, at the Royal Albert Hall, in London.

Lara Stone (left) and Jameela Jamil during the Teenage Cancer Trust series of charity gigs, at the Royal Albert Hall, in London.

John Bishop performing on stage during the Teenage Cancer Trust series of charity gigs, at the Royal Albert Hall, in London. PRESS ASSOCIATION Photo. Picture date: Tuesday March 25, 2014. Photo credit should read: Yui Mok/PA Wire

John Bishop performing on stage during the Teenage Cancer Trust series of charity gigs, at the Royal Albert Hall, in London. PRESS ASSOCIATION Photo. Picture date: Tuesday March 25, 2014. Photo credit should read: Yui Mok/PA Wire

John Bishop performing on stage during the Teenage Cancer Trust series of charity gigs, at the Royal Albert Hall, in London. PRESS ASSOCIATION Photo. Picture date: Tuesday March 25, 2014. Photo credit should read: Yui Mok/PA Wire

John Bishop performing on stage during the Teenage Cancer Trust series of charity gigs, at the Royal Albert Hall, in London.

Patrick Kielty performing on stage during the Teenage Cancer Trust series of charity gigs, at the Royal Albert Hall, in London.

Patrick Kielty performing on stage during the Teenage Cancer Trust series of charity gigs, at the Royal Albert Hall, in London.

Patrick Kielty gives a member of the audience a glass of wine, during the Teenage Cancer Trust series of charity gigs, at the Royal Albert Hall, in London.

Jason Manford performing on stage during the Teenage Cancer Trust series of charity gigs, at the Royal Albert Hall, in London.

Patrick Kielty performing on stage during the Teenage Cancer Trust series of charity gigs, at the Royal Albert Hall, in London.

Micky Flanagan performing on stage during the Teenage Cancer Trust series of charity gigs, at the Royal Albert Hall, in London.

Micky Flanagan performing on stage during the Teenage Cancer Trust series of charity gigs, at the Royal Albert Hall, in London.

Micky Flanagan performing on stage during the Teenage Cancer Trust series of charity gigs, at the Royal Albert Hall, in London.

Micky Flanagan performing on stage during the Teenage Cancer Trust series of charity gigs, at the Royal Albert Hall, in London.

Micky Flanagan performing on stage during the Teenage Cancer Trust series of charity gigs, at the Royal Albert Hall, in London.

Micky Flanagan performing on stage during the Teenage Cancer Trust series of charity gigs, at the Royal Albert Hall, in London.

Hal Cruttenden performing on stage during the Teenage Cancer Trust series of charity gigs, at the Royal Albert Hall, in London.

Presenter Richard Bacon on stage during the Teenage Cancer Trust series of charity gigs, at the Royal Albert Hall, in London.

Micky Flanagan performing on stage during the Teenage Cancer Trust series of charity gigs, at the Royal Albert Hall, in London.

Jameela Jamil and Adam Pitts From Lawson during the Teenage Cancer Trust series of charity gigs, at the Royal Albert Hall, in London.

Jameela Jamil and Adam Pitts From Lawson during the Teenage Cancer Trust series of charity gigs, at the Royal Albert Hall, in London.

Harry Potter stars James and Oliver Phelps during the Teenage Cancer Trust series of charity gigs, at the Royal Albert Hall, in London.

(left to right) Patrick Kielty, Richard Bacon, Micky Flanagan, Jason Manford, Rob Beckett and Hal Cruttenden backstage during the Teenage Cancer Trust series of charity gigs, at the Royal Albert Hall, in London.

(left to right) Patrick Kielty, Richard Bacon, Micky Flanagan, Jason Manford, Rob Beckett, Hal Cruttenden and John Bishop backstage during the Teenage Cancer Trust series of charity gigs, at the Royal Albert Hall, in London.

(left to right) Patrick Kielty, Hal Cruttenden, Rob Beckett, Roger Daltrey, Micky Flanagan and John Bishop backstage during the Teenage Cancer Trust series of charity gigs, at the Royal Albert Hall, in London.

(left to right) Patrick Kielty, Richard Bacon, Micky Flanagan, Jason Manford, Rob Beckett, Hal Cruttenden and John Bishop backstage during the Teenage Cancer Trust series of charity gigs, at the Royal Albert Hall, in London.

Richard Bacon, Patrick Kielty, Micky Flanagan, Hal Cruttenden, Rob Beckett and John Bishop with children backstage during the Teenage Cancer Trust series of charity gigs, at the Royal Albert Hall, in London.

(left to right) Patrick Kielty, Richard Bacon, Micky Flanagan, Jason Manford, Rob Beckett, Hal Cruttenden and John Bishop backstage during the Teenage Cancer Trust series of charity gigs, at the Royal Albert Hall, in London.